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JSONSax: Use a RootValue

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More #3377.
This commit is contained in:
Eelco Dolstra 2020-04-16 17:28:32 +02:00
parent 10e17eaa58
commit 9f46f54de4
1 changed files with 31 additions and 32 deletions
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47
src/libexpr/json-to-value.cc
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@ -4,7 +4,6 @@
#include <nlohmann/json.hpp> #include <nlohmann/json.hpp>
using json = nlohmann::json; using json = nlohmann::json;
using std::unique_ptr;
namespace nix { namespace nix {
@ -13,30 +12,30 @@ namespace nix {
class JSONSax : nlohmann::json_sax<json> { class JSONSax : nlohmann::json_sax<json> {
class JSONState { class JSONState {
protected: protected:
unique_ptr<JSONState> parent; std::unique_ptr<JSONState> parent;
Value * v; RootValue v;
public: public:
virtual unique_ptr<JSONState> resolve(EvalState &) virtual std::unique_ptr<JSONState> resolve(EvalState &)
{ {
throw std::logic_error("tried to close toplevel json parser state"); throw std::logic_error("tried to close toplevel json parser state");
}; }
explicit JSONState(unique_ptr<JSONState>&& p) : parent(std::move(p)), v(nullptr) {}; explicit JSONState(std::unique_ptr<JSONState> && p) : parent(std::move(p)) {}
explicit JSONState(Value* v) : v(v) {}; explicit JSONState(Value * v) : v(allocRootValue(v)) {}
JSONState(JSONState & p) = delete; JSONState(JSONState & p) = delete;
Value & value(EvalState & state) Value & value(EvalState & state)
{ {
if (v == nullptr) if (!v)
v = state.allocValue(); v = allocRootValue(state.allocValue());
return *v; return **v;
}; }
virtual ~JSONState() {}; virtual ~JSONState() {}
virtual void add() {}; virtual void add() {}
}; };
class JSONObjectState : public JSONState { class JSONObjectState : public JSONState {
using JSONState::JSONState; using JSONState::JSONState;
ValueMap attrs = ValueMap(); ValueMap attrs;
virtual unique_ptr<JSONState> resolve(EvalState & state) override std::unique_ptr<JSONState> resolve(EvalState & state) override
{ {
Value & v = parent->value(state); Value & v = parent->value(state);
state.mkAttrs(v, attrs.size()); state.mkAttrs(v, attrs.size());
@ -44,17 +43,17 @@ class JSONSax : nlohmann::json_sax<json> {
v.attrs->push_back(Attr(i.first, i.second)); v.attrs->push_back(Attr(i.first, i.second));
return std::move(parent); return std::move(parent);
} }
virtual void add() override { v = nullptr; }; void add() override { v = nullptr; }
public: public:
void key(string_t & name, EvalState & state) void key(string_t & name, EvalState & state)
{ {
attrs[state.symbols.create(name)] = &value(state); attrs.insert_or_assign(state.symbols.create(name), &value(state));
} }
}; };
class JSONListState : public JSONState { class JSONListState : public JSONState {
ValueVector values = ValueVector(); ValueVector values;
virtual unique_ptr<JSONState> resolve(EvalState & state) override std::unique_ptr<JSONState> resolve(EvalState & state) override
{ {
Value & v = parent->value(state); Value & v = parent->value(state);
state.mkList(v, values.size()); state.mkList(v, values.size());
@ -63,19 +62,19 @@ class JSONSax : nlohmann::json_sax<json> {
} }
return std::move(parent); return std::move(parent);
} }
virtual void add() override { void add() override {
values.push_back(v); values.push_back(*v);
v = nullptr; v = nullptr;
}; }
public: public:
JSONListState(unique_ptr<JSONState>&& p, std::size_t reserve) : JSONState(std::move(p)) JSONListState(std::unique_ptr<JSONState> && p, std::size_t reserve) : JSONState(std::move(p))
{ {
values.reserve(reserve); values.reserve(reserve);
} }
}; };
EvalState & state; EvalState & state;
unique_ptr<JSONState> rs; std::unique_ptr<JSONState> rs;
template<typename T, typename... Args> inline bool handle_value(T f, Args... args) template<typename T, typename... Args> inline bool handle_value(T f, Args... args)
{ {